LOWER POWER CMOS CIRCUIT FOR HEARING AID FEEDBACK

说明： 助听器(HA)最重要的功能是放大声音，以便 以弥补听力受损造成的听觉敏感度的损失。 任何HA履行该功能能力都可以显著地 从HA接收器输出的放大声音到达 麦克风和我重新放大，导致这个过程在一个 再生闭环系统。熟悉的结果是振荡的。 反馈(FB)，表现为声音质量的可听失真和高 尖叫，这让房委会毫无用处。目前还不存在 除降低增益外调频问题的实用解决方案 哈，从而损害了它最重要的功能。 建议研究的主要目的是推行医管局 该算法可以大幅度减少调频问题。我们计划 开发并评估了一种高性能的数字调频对消算法 低功率H电路，并将该算法和电路传输到HA 用于商业助听器的制造商。我们 建议进行为期三年的算法模拟和 实时实现、数字电路设计和制造、原型 助听器建造，实验室现场试验评估 正常听力和听力受损的受试者。

DESCRIPTION: The most important function of a hearing aid (HA) is to amplify sound so as to compensate for loss of auditory sensitivity caused by hearing impairment. The ability of any HA to fulfill this function can be significantly compromised where amplified sound output from the HA receiver reaches the microphone and i re-amplified, causing the process to repeat in a regenerative closed loop system. The familiar result is oscillatory feedback (FB), manifest as audible distortion of sound quality and high pitched squealing, which renders the HA useless. At present there exists no practical solution to the problem of FM other than to reduce the gain of the HA, and thus to compromise its most important function. The primary objective of the proposed research is to implement a HA algorithm that can substantially reduce the problem of FM. We plan to develop and evaluate a high performance digital FM cancellation algorithm in a low power H circuit, and to transfer this algorithm and circuit to a HA manufacturer for implementation in commercially available hearing aids. We propose to conduct a three-year program of algorithm simulation and real-time implementation, digital circuit design and fabrication, prototype hearing aid construction, an laboratory field trial evaluations with normally hearing and hearing impaired subjects.